188043649 has 2 divisors, whose sum is σ = 188043650. Its totient is φ = 188043648.

The previous prime is 188043631. The next prime is 188043677. The reversal of 188043649 is 946340881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182250000 + 5793649 = 13500^2 + 2407^2 .

It is a cyclic number.

It is not a de Polignac number, because 188043649 - 2¹⁵ = 188010881 is a prime.

It is not a weakly prime, because it can be changed into another prime (188043949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94021824 + 94021825.

It is an arithmetic number, because the mean of its divisors is an integer number (94021825).

Almost surely, 2^188043649 is an apocalyptic number.

It is an amenable number.

188043649 is a deficient number, since it is larger than the sum of its proper divisors (1).

188043649 is an equidigital number, since it uses as much as digits as its factorization.

188043649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 188043649 is about 13712.9008236770. The cubic root of 188043649 is about 572.9097632796.

The spelling of 188043649 in words is "one hundred eighty-eight million, forty-three thousand, six hundred forty-nine".